Spraying devices for powder



DC; 4, 1.956 G. DENvoR 2,772,816

SPRAYING DEVICES FOR POWDER Filed March a, 1954 SPRAYING DEVICES EoR POWDER George Denver, St. Marys Terrace, London, England l Applieaiion March s, 1954, serial No. 414,829 Claims Priority, aprlicatipnoreai Britain March 12, 1953 -1s claims. (ci. zzz- 139) This invention relates to spraying devices for powder or solid substances of small granular mesh, which substances hereinafter willbe referred to generally as powder, the device being" adapted to act as an air pump toeject and spray or diffuse the powder.

One objectof the invention is to provide an expendible hand-operated sprayer, in which substantially the whole of the interior thereof can be utilised to contain the powder to be sprayed, and to ensure an ample, even, uniform controlled andpowerful'jet or spray of powder through the spraying orifice, in all positions in which the device may beheld, thus catering for upward, horizontal or downward spraying.

A powderspraying device, accordingto the present invention, includes inner and louter telescopically mounted cylinders, adapted to form a reciprocatory air pump,

the inner cylinder forming a powder container, an Vair tube passing through theinner cylinder to terminate in a position nea-r thetop of the powder container, and a one-way valve in association with, that is to sayY withinV or on top of the air tube, to define, between the valve and the top` of the air tube, a powder reservoir, the arrangement being such that, for downward or horizontal spraying, the air tube delivers a stream yof air through the powder in the area between the top `of the air tube and the top lof the inner cylinder, to carry powder to a spraying orifice, whilst, for upward spraying, the powder in the reservoir is carried tothe spraying orifice.

The spraying orifice may be in axial alignment wit-h the air-tube, which may be positioned closeto the wall of the powder container, but preferably is positioned diametrically opposite said -air tube. In the latter case, the delivery end of said air tube leads into a shield which may be semi-,conical in shape and extends over the pow- I der spraying orifice and Vis adapted `*to form a small receiving or collecting chamber for powder, which is blown out of the 'chamber through the spraying orificeby the air from the tube. i i

The shield is so formed as to leave a'space vor inlet for powder so that only a' limited quantity of powder is trapped therein; a filter may be provided within the shield to minimize blockage dueto lump formation in the powder mass.

The chamber collects only sufficient powder for each horizontal or downwardly spraying operation, the powder andair being guidedby the shieldto the spraying orifice, so that efiicient and powerful sprayingis possible.

The shield may be carried by a disc secured to the top end of the powder container and have an opening therein larger than the` spraying orifice in the said top end, but partly in register with saidrspraying orifice. When the one-way'valve is mounted on top of the air tube, a sleeve may be telescopically mounted on the delivery end of the air tube, to provide,` with the valve, thepowder reservoir, the capacity of which can be varied by relative movement between the sleeve and tube; preferably the one-Way valve is secured on the top of the air tube and defines the bottom of the powder reservoir.

liatented pee.` 4,7

, lCe

j Said valve preferably taires the form fof" adisc of fibrous material having a smooth surface on the underside and a hairy surface on the top, e. vg. swansdown cloth; with such a swansdown cloth valve, air can pass freelythrough' from the lower to the top, whilst air attempting to pass in reverse direction presses thehairs downto providea powder seal.

Due to the provision of the air tube," it will be ap` parent that air, drawn into the device-by the pumping operation, is compressed into a relatively small areadefined by the diameter of the air tube and' issues therefrom as a powerful stream which either passes directly to the spraying orifice, when this is iin axial alignment with the air tube, or is directed to said orifice by the shield. i i

One form of spraying device according to this inv'ention is illustrated in the accompanying drawing, in which Figure l is a vertical section and AFigure 2 a plan view of the inside of the top of the device on the line II--II Figure 1. Referring to the drawing, the spraying device includes acylinder unit indicated asa wh-ole by the numeral 1 and comprising an upper cylinder 1aand lower cylin? der 1b lover the latterof which is slidable an outer cylinder 2. vThe cylinder 1b is shown in the present instance as being formed with a projecting ring 3 forming a stop to limit upward movement of the cylinder 2 yon the cylin-` der 1b. The cylinder 1a may fitltightly around the por` tion Iof the cylinder 1b projecting above the ring while the cylinder 2 is freely slidable on the cylinder 1b. The specific structure of the cylinder unit'l may beof any practicable form. lFor example, the ring f3- may be eliminated andthe lower endof the cylinder 1a may be exe tended downwardly and serve as a stop to limit inward movement of the cylinder 2. The cylinder 1d is closed at the top as at 1c andpis formed with a spraying orifice 4 which, when thedevice is not'in use, may beclosed, by a rubber or like plug S shown in broken lines'inlFigf ure 1. .4

An air tube 6is fixed Vin an Yopening in the bottom end 7 of the inner cylinder 1a, which forms the powder container, and extends upwardly through said cylinder adjacent the w-all thereof. The air tube 6 is open at the bottom and at the top carries a one-way valve 8 in the form of a cap ofswansdown cloth, as defined above. It will Vbe appreciated that the air tube 6 is open to the f-ree passage of air from outside theinner cylinder 1a. The outer cylinder 2 has avperforated closure 9 at its bottom end, an aperture being lshown at 10, for the entry of air from the atmosphere, and is .also provided atthat end with a iiap valve 11, which may be made of thin material such as paper, so that, on outward relative movement between the two cylinders 1, 2,1the aperture vor apertures `10 is or are uncovered by the. fiap valve 11 to allow air to enter the outer cylinder and, on inward relative movement between the two cylinders, said aperture or apertures is orare closed. Slidably mounted on the top of the air tube '6 is a sleeve 12, which, when projecting above, the top end of the air tube, forms, a powder reservoir, 13, the baseof which is provided by the one-way valve 8.;

Secured to the top closure 1c, preferably through the intermediary of a disc 14, Vis a shield 15, the securing being performed by any convenient means, for example by staples 16, as shown more particularly in Figure 2.` Within the ent-rance to the shield is a. filter 17.

The space between the top of the sleeve 12 and the spraying orifice 4 forms a powder collecting chamber 18; the top of the sleeve 12 may, when sliddenY over the an tube 6, even extend into the said chamber nearthe larger part thereof remote from the spraying orifice 4. It will be apparent that a gap 19 is provided at the largonend ofthe. clanibier'l-S, close to the side of the cylinder-1,s'othatg when 'the'devic'e is rotated'or'dipped,

18 A n Y f1S1IPerforeiteL landl?..1.r.1g\e Y its u'pp'e'rendby jthe'valv'e', it will be apparent that no powder over iindst Wayintotheeininbe. VY-:Tliespraying;device, asillnstratedQcan readilybe utider 1.

,fille device. maybe inclined downwardly towardstthe lfetionfo be,v Plfyedgfeare "then beingftaken ,toisee that` tfh spraying iiiice. 4' isfat the top of closure 16. In these conditions, powder /frointh'e innerfcylinder y1 spills intothe spacel 18 above the top of the sleeve 12, i, e., thepovvderoolleeting Chamber .19- l' relative reciprocationbetween. the outer and `inner cyl ders, airis `d1jawninto the outer cylinder 2 on the ard lstroke andisvforced ,into the 'aiitube` 6 on vthe r'ds't r`oke. this operation, a, stream .of airis for eedthrodgh the airtnbe 6, through the-one-way valve Sjto 'carrypowder thereab'ove, 'through 'the lter.17 in theshfield 1'5,v yto the spraying orifice 4, so that the powder is'fsprayed'jor.diifused therethrough,.the shield 1S acting alsfa'iguide'forl'theair andpowder entrained thereinto thel sprayingorifice'.r

It` w'illfbeV appreciated that, with the spraying device heldlhorizontally; t-hefsam'e action will b'e. obtained, pro? vided the device rstlbe dipped Hto allow powder tolfall into the,.spacellsjabovepthe sleevelZ.

WHIIL' hOWeYeVI", 'it isy desired'torsprayin an upward directionj'or evenuvetically upwards, the 'CleViSIeis` first of y,alldi'pped downwards so` that ypowder illsfthe space 18 Vabove "the sleeve :'12 and, whenY the' device is 4then brought into an upward direction, ,powder enters the powder reservoir 13A and, onkrelfa'tivel rriovenientllofV 'the inner andlouter cyliiiders, the powder Vin the' reservoir ils forced by f the 'air fstr'earn `into, n the funnel 15v `through the filter 17,'l and again into the. sprayings orifice. v'Due to the lpositioning' of the ,air tlibe 6 Hand fits `sleeve 12, powder lcan he 'scooped finto ,the powder reservoir '-13 whenihegdvioe'is Vtilted doyvnwalrdathus enabling ,the leervoi'r fo .be'filled vfor ylllpwar'd vspraying. `d"Pa-rt icnlar atte'nti-onisinvitedfto` the'ffact that the oriicejllis offset frorr'ithe4 alii-s ,fof the air.A tube'v 6. n More specifically, the oice 4` preferably is arranged .relative to theaxis of lin'cl'er .unit 1,fdiarhetrically.k opposite ,the aintube l6. YLess advii'tageoiis fr'esuls"woldfbe,obtainediffthe orifiife`-4l were in -i-alirienrn'ent zWith, the axis. ,of thev tube '6 s'in'cethe. fair pumpe th .oughthe orice 4 rwonld befar les's 'effettive in p1 ing filp, and blowing the. Powder through'tlie orice ,'With the,x alfrngerrljentv shown, the ainsreamis far moreljeliectively iitiliz'erl"V *blowin'ghpowde'th'rongh the bric'e, '4,f afsiibstantia'lly. denser spray thusboingnrovided. Y

ebrei/ing downwards. it willbe appreciated.- that the quantity of Powder Y'ivliisih can. j'be `,Carried oilf'y `the irfsfram 7can"be,increasedfor. -reduedby increasing or reducing the spacelbetweenthedelivery qndjnfjfhe `in tnbeiflvand theendy of ftliepowder'cylinderv` 1 by sliding movement. `of the ,sleeve .lf2` on the, airftube, 6.

In whatever position the :device may beheld, the bnlk einen/dei inthel .Container e'yl'inderis heid.; ev/yfrom thefspra'y oriice bythevshieldf 1'5 and Yfilter 17, so that earner vdeiend .glfeene .ofthe ffle'ef are avoided. aste ofwpowder is prevented, as any agregue wardly, is limited to that which happens to be left in the"s'ma'll chamber,'if the plug "5 is not in position.

The device maybe made of any convenient material but, preferably, the cylinders, air tube and shield are made of cardboard.

I claim:

l. A powder spraying -,devicecomprising an inner cylinder forming a powder container, an :outer cylinder slidably mounted "on `said `irmercylin-der, an ioutlt in the bottom of said outer` cylinder and aone-wayyalveain conjunction with saidUoutlet, whereby Ythe cylinderswfogether form a.1re ciprocatory air;- pnmp, an iairftnbe. passing through` the innereylinden-Poitioned @lose tothe wall lofthe-inner cylinder,tolterminate'in'a'position near the top of the pwderontainen'and aone-way valve in association with the top of the air-tube, to define between the said valve and the top of the air tube a powder reservoir, the arrangement being such that, for downward-of hofizontelnprnying, .thegeirtnbe delivers e stream ofreir, {through-,the .powder inthe -ereabetvveen the-rop of the air tubelan-dthe top :of herinner ,ylindely .to carry powderJ to d Spraying :oriowwhSL-ffor upvverdsnreying, the powder in the reseryoir.iscar ried.to thevgspraying orifice. l

2.V Adevice as claimedin claiml.inwhi chl a 4sleeve is telescopically mounted .on the delivery. end .of vthe air tube, in. `which ease the onervvey valve iefp'ositionedef the open -end lof the.air` tube, ythey telescopicsleeve Ibeing provided for varying the-.capacityoiithepowder.reseryoir. 3.4 A device as claimed inelaim vl :in whic'hgtheoneway valve on top of the air tube consistsv oia,sheetf,of brous material, snch as ,swansdiownf-cloth,f,said .valve defining the bottom of ,the powderjreservvoir.

L 4. A device asiclairnedongelaim 1 iin yvhicha shield is positioned Varound thepowder sprayingoriiiccainto which ,shield ythel air tube..leads,said shieldwforming a Smell-.powder receiving. ehernbernvlvhiloh Powderen `bo blown out ofi said chamber itlironghjthe.spraying. oriiice byjthe air .fnom thevfairtube ,Y Y i 5., A pbwder spraying dev ieecornprising anelongated ho11 owbody:having a .een ,at .one endrfovded .with en outlet prifice and having: a closure at-/itsgqther5 end, .v said body having afehieldthereinndeiining -vviihlseidi foal? en outlet chamber, *said body beingl adapted. .to .contain a powder to be. sprayed, vanairA tube within (said, body ,open at its ends., and.' having one. end.. .eommunioeting said outlet gcharnberfand havingfitsotl1er end {communieating kthrough sndellonure al seid other; entl- .f- Sad bgdy, aeheek valve in seid` .aintulie opening;toward.Said outlet chamber, a pump' body -slidablefon saidgother endnvof said.e lI iollew bodylend ,corresnonding ,in elfos-S1de etionel Shape thereto,y .said tpnrnn .bodnhavine @,el'osllre fatihe end thereof adiacenti :the -oloSiire-fof .dad'lhilw .body provided with -anair inletopening, and `niairiward1y openi chamber,

6. A device :es -elalnedin ,claim 5l whereinvsaid discharge oriieefis substantially,otsetdaterallyno low body fromgsaidair tube.

7. A device. as elaimedginelaimi v5-fvvlnereirnSeid; diS- charge w ioriice is substantially offset. laterally.l of lsaidLhoL toward said, cap. .--Whenebyi ,said `discharge .chamber decreases in .cross',Sectionil:.jaleairont said ain-tube `tosaid discharge orifice. y

8. A device. .claimedginnclairn5,.wherein .said-discharge f orliiiceV is substantially ofsetilaterally. of said hollow l-bod'yfrom said air-tb'e, fsaid :shieldebeingcinelined toward said cap whereby said discharge chamber decreases in cross sectional area from said air tube to said discharge oritice, and a filter arranged between said air tube and said discharge orice in said discharge chamber.

9. A powder spraying device comprising a container cylinder having a cap on one end and a closure at the other end, said cap being provided with a discharge oriiice, a shield extending across the interi-or of said container cylinder and dividing the latter to form a discharge chamber adjacent said discharge orifice and a container chamber between said shield and said closure, anV imperforate air tube one end of which extends-through said closure and the other end of which opens into said discharge chamber, a check valve in said air tube opening toward said discharge chamber, a pump cylinder slidable over said container cylinder at the end thereof opposite said discharge chamber, said pump cylinder having a head outwardly of the closure of said container cylinder provided with an inlet opening, and an inwardly opening ap valve carried by the head of said pump cylinder to admit air into said pump cylinder whereby, upon outward movement =0f said pump cylinder, air will flow thereinto and upon inward movement of said pump cylinder air will be forced from said` pump cylinder Y 11. A device as claimed in claim 9 wherein said discharge orifice is diametrically opposite said air tube with respect to the axis of said container cylinder, and wherein said shield slopes from said air tube toward said cap whereby said discharge chamber decreases in cross sectional area toward said discharge orifice.

12. A device as claimed in claim 9 wherein said discharge orice is diametrically opposite said air tube with respect to the axis of said container cylinder, and wherein a filter is arranged in said discharge chamber between said air tube and said discharge orifice and extends between said shield and said cap.

13. A device as claimed in claim 9 wherein said discharge orifice is diametrically opposite said air tube with respect to the axis of said container cylinder, and wherein a filter is arranged in said dischargechamber between said air tube and said discharge orifice and extends between said shield and said cap, said shield being inclined from sai-d air tube toward said oritice whereby the cross sectional area of said discharge chamber decreases toward said discharge orifice.

References Cited in the tile of this patent UNITED STATES PATENTS 1,715,986 Brown June 4, 1929 1,841,646 Slocum Jan. 19, 1932 2,071,580 Rose Feb. 23, 1937 2,315,581 Berenson Apr. 6, 1943 2,525,742 Weiss et al Oct. 10, 1950 2,580,580 Nicolle Jan. 1, 1952 

